A077198 - OEIS

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A077198

a(n) = lambda(sigma(n)), where lambda(n) is the Carmichael lambda function, which gives the smallest integer m such that k^m = 1 mod n for all integers k relatively prime to n.

1

1, 2, 2, 6, 2, 2, 2, 4, 12, 6, 2, 6, 6, 2, 2, 30, 6, 12, 4, 6, 8, 6, 2, 4, 30, 6, 4, 6, 4, 6, 8, 6, 4, 18, 4, 12, 18, 4, 6, 12, 6, 8, 10, 6, 12, 6, 4, 30, 18, 30, 6, 42, 18, 4, 6, 4, 4, 12, 4, 6, 30, 8, 12, 126, 6, 12, 16, 6, 8, 12, 6, 12, 36, 18, 30, 12, 8, 6, 4, 30, 110, 6, 6, 24, 18, 10, 4

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OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

Index entries for sequences related to sigma(n)

FORMULA

a(n) = A002322(A000203(n)). - Antti Karttunen, Nov 18 2017

MATHEMATICA

Table[CarmichaelLambda[DivisorSigma[1, n]], {n, 1, 100}]

PROG

(PARI) A077198(n) = lcm(znstar(sigma(n))[2]); \\ Antti Karttunen, Nov 18 2017

CROSSREFS

Cf. A000203, A002322.

Cf. also A062401, A290088.

Sequence in context: A077894 A374031 A053214 * A046110 A296091 A352892

Adjacent sequences: A077195 A077196 A077197 * A077199 A077200 A077201

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Nov 30 2002

STATUS

approved